Q. In a turnstile antenna the crossed dipoles are excited with voltages

View solution

Q. Directivity of antenna is defined as

View solution

Q. Consider the following; for a loss-less transmission line we can write,

1. Zin = - jz0 for a shorted line with l = λ/8
2. Zin = ± j ∞ for a shorted line with l = λ/4
3. Zin= jz0 for an open line with l = λ/2
4. Zin = 0 for a matched line of any length

Select the correct answer using the codes given below codes.

View solution

Q. Strip lines are used at

View solution

Q. ∇² is

View solution

Q. End fire array has narrow bandwidth.

View solution

Q. Which of the following antenna is best guided by a waveguide?

View solution

Q. Poynting vector is the rate of energy flow having

View solution

Q. A ship-to-ship communication system is plagued by fading. The best solution seems to be the use of

View solution

Q. If a wave is propagated in free space, it will be in nature of

View solution

Q. When the height of a vertical earthed antenna is less than λ/4

View solution

Q. Which of the following is a circularly polarized antenna?

View solution

Q. During day time ionosphere consist of

View solution

Q. To couple a coaxial line to a parallel wire line, it is best to use a

View solution

Q. Which of the following is λ/2 length?

View solution

Q. Which of the following is the main difference between waveguide and transmission line?

View solution

Q. Television signals are propagated as ground waves.

View solution

Q. The characteristic impedance of loss less transmission line is

View solution

Q. For a hollow waveguide, the axial current must necessarily be

View solution

Q. Industrial heating furnaces such as arc and induction furnaces operate on __________ power factor

View solution